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• W4289261737 abstract "Flash drought often leads to devastating effects in multiple sectors and presents a unique challenge for drought early warning due to its sudden onset and rapid intensification. Existing drought monitoring and early warning systems are based on various hydrometeorological variables reaching thresholds of unusually low water content. Here, we propose a flash drought early warning approach based on spaceborne measurements of solar-induced chlorophyll fluorescence (SIF), a proxy of photosynthesis that captures plant response to multiple environmental stressors. Instead of negative SIF anomalies, we focus on the subseasonal trajectory of SIF and consider slower-than-usual increase or faster-than-usual decrease of SIF as an early warning for flash drought onset. To quantify the deviation of SIF trajectory from the climatological norm, we adopt existing formulas for a rapid change index (RCI) and apply the RCI analysis to spatially downscaled 8-d SIF data from GOME-2 during 2007-2018. Using two well-known flash drought events identified by the operational US Drought Monitor (in 2012 and 2017), we show that SIF RCI can produce strong predictive signals of flash drought onset with a lead time of 2 wk to 2 mo and can also predict drought recovery with several weeks of lead time. While SIF RCI shows great early warning potential, its magnitude diminishes after drought onset and therefore cannot reflect the current drought intensity. With its long lead time and direct relevance for agriculture, SIF RCI can support a global early warning system for flash drought and is especially useful over regions with sparse hydrometeorological data." @default.
• W4289261737 created "2022-08-01" @default.
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• W4289261737 date "2022-08-01" @default.
• W4289261737 modified "2023-10-01" @default.
• W4289261737 title "Flash drought early warning based on the trajectory of solar-induced chlorophyll fluorescence" @default.
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• W4289261737 doi "https://doi.org/10.1073/pnas.2202767119" @default.
• W4289261737 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35914136" @default.
• W4289261737 hasPublicationYear "2022" @default.
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